Watchdog (MCU):
The MCU is powered as soon as power is connected to the J90 carrier board. It is powered by a LDO which supports an input voltage up to 30V. The MCU can enable power to the J90 carrier board when the voltage is in the supported voltage range (7V to 17V). The MCU monitors the power input, 5V, 3.3V and 1.8V rails. The UART0 console port of the TX1/TX2 is piped through the MCU. This allows the MCU to monitor the operating status of the TX1 and TX2. The MCU can take action and hardware reset the TX1/TX2 or power it down. The MCU is a 32 bit ARM Cortex M0 micro controller with 32kB Flash and 6kB RAM. It is programmed in C and source code (Atollic TrueStudio project) can be provided. Please contact us for details.